Is there Linux support for
Quark2, Tau2, legacy Photon cameras?

FLIR offers a Camera Control SDK that contains ‘C’ source code
to compile in other operating systems such as Linux. There is a basic
example in the SDK that would work in the Linux environment. The
example contains the commands needed for a customer to write their own
camera control application. The Camera Control SDK part number is
110-0142-16.